The subcostal echocardiographic view is best obtained with the patient supine, knees bent to relax abdominal muscles, and the patient holding a deep breath at the end of inhalation to lower the diaphragm and improve acoustic window through the subxiphoid area.
Left lateral decubitus position is used for parasternal and apical views but is not optimal for subcostal imaging.
This patient positioning and respiration technique are described in the "Textbook of Clinical Echocardiography, 6e", Chapter on Echocardiographic Windows and Imaging Techniques【20:90-95†Textbook of Clinical Echocardiography】.
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